Free physics question bank
atomic structure and bohr atomic model questions with solutions
Practice Atomic Structure and X-rays for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
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- NumericmediumAtomic Structure and X-rays
A hydrogen atom initially in its third Bohr orbit collides with another particle. During the collision, the hydrogen electron falls to the second Bohr orbit and the released internal energy is converted into translational kinetic energy rather than radiation. The total translational kinetic energy before the event is 5.00 eV. If the total translational kinetic energy immediately after the collision is (N ÷ 100) eV, find N.
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A neutral helium atom of mass approximately 4u moves toward a stationary ground-state hydrogen atom of mass approximately u. During an inelastic collision, the hydrogen atom is to be excited to its first excited state. Using the non-relativistic threshold condition and neglecting electron masses in the atomic masses, if the minimum helium kinetic energy is N eV, find N.
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A hydrogen atom of mass approximately u collides with a stationary He⁺ ion of mass approximately 4u. The electron in He⁺ is initially in its ground state. Using the non-relativistic threshold condition, what minimum kinetic energy must the incident hydrogen atom have to excite the He⁺ electron to its second Bohr orbit? If the answer is N eV, find N.
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A hydrogen atom has its electron initially in the third Bohr orbit. It directly returns to the second orbit. Take hc = 1240 eV·nm. If the emitted wavelength is approximately N nm, find N to the nearest integer.
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In a Rutherford α-particle scattering experiment, identical α-particles having the same kinetic energy are incident separately on two thin metallic foils. The first foil has atomic number Z₁ = 30 and the second has atomic number Z₂ = 60. The foil thickness, target-atom number density, detector solid angle and scattering angle are identical. If the count rates are N₁ and N₂ respectively, what is N₂ ÷ N₁?
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A hydrogen atom is initially in its ground state and absorbs a photon of energy 10.2 eV. Assuming the photon is absorbed completely and the atom remains bound, find the principal quantum number N of the excited state reached by the electron.
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A hydrogen atom in ground state is given an energy of 10.2 eV. How many spectral lines will be emitted due to transition of electrons ?
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JEE Mains 2024 09 Apr Evening Shift
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For the hypothetical logarithmic-potential atom U(r) = a ln(r ÷ r₀), Bohr quantization gives rₙ proportional to n. Which dependence therefore appears in the energy difference between two stationary levels n₁ and n₂?
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A moving hydrogen atom in its ground state collides with an identical ground-state hydrogen atom initially at rest. After the collision, both atoms are required to be in their first excited states. Assume equal atomic masses and use the non-relativistic threshold condition including momentum conservation. If the minimum incident kinetic energy is (N ÷ 10) eV, find N.
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Radius of a certain orbit of hydrogen atom is 8.48 Å. If energy of electron in this orbit is E/x, then x = _________. (Given a₀ = 0.529 Å, E = energy of electron in ground state)
JEE Mains 2024 06 Apr Morning Shift
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